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Assets Held for Sale and Discontinued Operations - Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Provision for (reversal of) allowance for doubtful accounts, net | $ 1,074 | $ 45 | $ (720)
Gain on sale of subsidiary | 1,614 |  |
Tempress and SoLayTec | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
(Loss) income from discontinued operations, net of tax | (8,297) | (1,326) | 6,937
Non-cash impairment charges | 0 | 4,759 | 0
Depreciation and amortization | 562 | 801 | 1,120
Provision for (reversal of) allowance for doubtful accounts, net | 874 | (56) | (837)
Gain on sale of subsidiary | 1,614 | 0 | 0
Purchases of property, plant and equipment | $ 131 | $ 1,403 | $ 838

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